Abstract
This study aimed to observe the response of 32 rice accessions to attack of sugarcane borer (Diatraea saccharalis Fabr., 1794). Twenty larvae were placed on the leaf sheaths of rice plants. At 30 days after infestation, the rice plants were cut at ground level and taken to the laboratory to analyse the signs of borer attack, external and internal diameter of the stem and weight of surviving larvae. The results of the morphological traits of the rice plant, response of the plant to insect attack and development of the sugarcane borer larvae indicated a genotypic variation. The accessions that most favored larval survivals were IRAT 124 and MEARIN. Larvae with highest weight (0.0643 g) were found in IAPAR L 99-98 and the largest internal diameters of the rice stem (5.65 mm) were found in LAC 12. These accessions (IRAT 124, MEARIN, IAPAR L 99-98 and LAC 12) remained morphologically grouped with IAC 47, cultivar susceptible to sugarcane borer. The most tolerant materials based on the ability to produce new tillers after larval infestation were BR IRGA 417 and MTU 15. The results of this study indicate that all the morphological traits were able to separate the accessions of rice into different groups in relation to resistance to the sugarcane borer D. saccharalis. These materials can be used as donor sources in pre-breeding for genetic resistance to sugarcane borers.
Highlights
Rice is one of the most important cereals in the world, which is responsible in developing countries for 95.2% ofHow to cite this paper: Nascimento, J.B. and de Freitas Barrigossi, J.A. (2014) Responses of Rice Mini-Core Collection Accessions to Damage by Diatraea saccharalis (Fabricius) Stem Borer
Univariate Analysis The phenotypic response of rice accessions to the borer, D. saccharalis, was significant (P < 0.05) by KruskalWallis test at 5% significance level, for the traits evaluated which indicated of the occurrence a genetic variation (Table 2)
The accesses that were more favorable to the survival of stem borers were IRAT 124 and MEARIN
Summary
Rice is one of the most important cereals in the world, which is responsible in developing countries for 95.2% ofHow to cite this paper: Nascimento, J.B. and de Freitas Barrigossi, J.A. (2014) Responses of Rice Mini-Core Collection Accessions to Damage by Diatraea saccharalis (Fabricius) Stem Borer. How to cite this paper: Nascimento, J.B. and de Freitas Barrigossi, J.A. In regards to the biotic factors, insects are the pests that cause the most damage to this crop; and among these insects, the sugarcane borer Diatraea saccharalis Fabricius (Lepidoptera: Crambidae) is found all over the Brazil infesting various grasses and causing economic losses in crops of upland and irrigated rice. This insect is of major importance for rice in the North and Midwest regions of Brazil [3]
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